Machine center



FIG. 1 is a perspective view of the machine center, showing the present design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left side view thereof.

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view of thereof.

The broken lines showing of rectangles are for the purpose of illustrating portions of the article and form no part of the claimed design. 

CLAIM The ornamental design for a machine center, as shown and described. 